![]() ![]() Runners are most prevalent in one-stage while it is the other way around in Ner from the cooled preform: thermal and mechanical. There are two ways to separate the hot melt coming through the hot run. Thermally Gated Hot Runner Nozzle Diagram Need to use preform gestige cutting machine to trim the preform, then can go on the strech blow molding with these preforms. Long length vestige preform hot runner nozzel without heater or very little length heater. ![]() The vestige difference is caused by the different hot runner nozzle design. Compare with thermally gated hot runner temperature controller, valved gated hot runner temperature controller have more controller zones. We only can see the hot runner socket on the mold. Valved gated hot runner preform every heater need to be controlled by sperated temperature controller zone. Valved gated hot runner use ring heaters and contain one manifold plate. Valved Gated Hot Runner Preform Mould Valved Gated Hot Runner With this reason thermally gated hot runner temperature controller have less controller zones compare with valved gated hot runner temperature controller. Thermally gated hot runner temperature controller one zone control one rod heater. So we can see the heaters and wires from preform mold one side. In order to easily assemble and maintain heaters, often there is no cover on the mold heaters insert side. Thermally gated hot runner use rod heaters and rod heaters were pluged into mold from one side to another side. This is an obvious difference on the preform mold profile. There are two different types hot runner widely used for preform moulds – valve gated hot runner and thermally gated hot runner. Otherwise self-lock preform mould with more cavity no. In case, quantity of the preforms is small, then nonself-lock preform mould with less cavity no. So order self-lock PET preform mould or nonself-lock PET preform mould, should be according the quantity of the preforms. ![]() Nonself-lock PET Preform MouldĬompare with normal preform mold, self-lock preform mold have longer life that preform neck without flash. Self Lock PET Preform MoldĪnd non-self lock PET preform mold (normal PET preform mold) resist the mold parting shifting mold by A plate and slider blocks. Please see below picture the area marked by red colour. Please see below picture the area marked by red colour. Self-lock preform mold each cavity insert and slider insert can resist the mold shifting. First, self-lock and non-self lock is about the structure on the mold parting which used to resist the mold shifting during injection molding. Some clients have question that what the difference between self-lock and non-self lock. We call non-self lock preform mold as normal preform mold. There are two type different structure on the preform mould - self-lock and non-self lock. Cores and cavities are always water cooled. For this purpose they are mounted on slides that are often cam-driven. The latter have to move during ejection of the part to release the undercuts created by the thread beads. We always keep the PET preform mould structure in our mind. Preform molds consists of the male core, the female cavity, and the neck inserts. All of XS Plastic Mould Co., Ltd engineers have been trained about the preform mould knowledge. So good preform mould strucutre is most important. XS Plastic Mould always keep the mind that a good quality preform mould start from the mould design. PP, PC and PET material stretch rate is different, so the preform design for them are different. And drink or water filling machine need this ring on the bottles. Transport ring is designed for the preform transport channel. Lots of automatical stretch blow molding machine use gripper to transport preforms, so preforms need a space for gripper to hold them. In this case, we have to insure the preform neck with enough wall thickness to bear the mandrel plug in force. Some full automatical stretch blow molding machine use mandrel to transport the preforms. Every preform have mouth, as after stretch blow molding the preform mouth will become bottle mouth. Before we introduce preform mold, we need to understand why preform designed in that way. ![]()
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